Our testing found that at velocities over 300 fps down-range accuracy at distances over 25 yards declined when using 100 grain replacement blade broad heads. The solution we found was to increase the “front of center” balance of the arrow, either by increasing the weight of the front insert or by increasing the weight of the broad head. We chose to increase the broad head weight since this allows the choice of using lightweight mechanical broad heads for maximum velocity or our Boltcutter broad heads for durability and accuracy with our arrows. Boltcutters are the perfect compromise between durability, velocity and accuracy. In testing with our fastest crossbow models Boltcutters consistently shot sub 4″ groups at 40 yards when used with Firebolt